In the Purnimanta calendar, Vat Savitri Vrat is observed during Jyeshtha Amavasya, which coincides with Shani Jayanti. The Vat Savitri fast is associated with the deep love and unshakable determination of Savitri, who defied even Yama, the god of death, to reclaim her husband’s life. Women worship the Vat (Banyan) tree on this auspicious day.